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Old Trane burner problem

I am working on a old standing pilot Trane BLU120E936B. The burners are in suprisingly good shape. There was some debris on them....like some white little foam balls???...some rusty powder inside them. They were'nt that rusty in the slots. So I cleaned them. It has four burners, and one of the middle ones will lite the length of the burner, then after a few seconds, slowly go out until it comes back to where there is a small ball of flame next to the crossover part of the burner next to the pilot. I adjusted manifold press from 2.5 w.c. to 4 in , recleaned burners, cleaned crossovers, adjusted pilot, checked orifice and it was clean. Any suggestions? BTW...the other burners are burning fine, and from what I can see my problem burner looks fine???

If the "ball of flame" is by the pilot assembly, I'm guessing its either the pilot flame itself, or the pilot assembly is in the path of the burner flame and disrupting it. How big is your pilot flame? As far as the manifold pressure, 4.0 sounds more like a boiler setup than a furnace. If it is a furnace it should be 3.5 if this is a natural gas unit. Also check for Flame distortion on blower start-up if it is a furnace

Thanks to everybodies replies I was able to fix it. I had to take the draft hood off and and remove metal pieces inside hx. After cleaning and vaccuming out upper hx the burners were fine. This website rocks! Thanks guys.